Wavetek 147 Dokumentacja Pobierz pdf (Strona 196)

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Digital Analysis (QAM View OPT4): Constellation Mode

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Use the alphanumeric keypad to define the new symbol rate, and then press

the Enter key. Edits to the symbol rate may be saved to the Channel Plan.

Using the Zoom Feature

Use the Zoom feature to examine the constellation in more detail. In 64

QAM, three grids are available for viewing – 8x8, 4x4, and 2x2 (see Figures

9-17 through 9-19). In 256 QAM, four grids are available for viewing –

16x16, 8x8, 4x4, and 2x2.

Press this key to enter the Zoom Submenu.

The top left quadrant of the constellation grid will be framed by a dark outline

(see Fig. 9-17). Use the diamond keys to move this frame to the desired

quadrant.

Press this key to Zoom-In one level on the framed quadrant.

In 64 QAM, a 4x4 grid will replace the original 8x8 grid, and a dark outline

will frame four of the blocks (see Fig. 9-18). Press this key again to see a

2x2 grid with only one block framed (see Fig. 9-19). This is the highest level

zoom in either modulation mode.

Press this key to Zoom-Out one level from the current view.

Press this key to Zoom-Out to the largest view possible on the

current channel.

Press this key to return to CONSTELLATION Main Screen.

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